Change camera info message to lower case (backport #1005)

[mergify]

Change camera info message to lower case since message type had been change in rolling and humble.

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This is an automatic backport of pull request #1005 done by Mergify.

[mergify]

Cherry-pick of bc5cab9 has failed:

On branch mergify/bp/iron/pr-1005
Your branch is up to date with 'origin/iron'.

You are currently cherry-picking commit bc5cab9.
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Unmerged paths:
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	both modified:   camera_calibration/src/camera_calibration/camera_checker.py

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